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| author |   Trond Myklebust <Trond.Myklebust@netapp.com> | 2010-05-13 12:51:06 -0400 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2010-05-14 15:09:34 -0400 |
| commit | 93a05e65c090dda9cbd79d0cf57b65c4dbd8da55 (patch) | |
| tree | bcffc5640b3038292362afb4283965b94f60cc0f /net/sunrpc | |
| parent | SUNRPC: Dont run rpcauth_cache_shrinker() when gfp_mask is GFP_NOFS (diff) | |
| download | linux-dev-93a05e65c090dda9cbd79d0cf57b65c4dbd8da55.tar.xz linux-dev-93a05e65c090dda9cbd79d0cf57b65c4dbd8da55.zip | |
SUNRPC: Ensure memory shrinker doesn't waste time in rpcauth_prune_expired()
The 'cred_unused' list, that is traversed by rpcauth_cache_shrinker is
ordered by time. If we hit a credential that is under the 60 second garbage
collection moratorium, we should exit because we know at that point that
all successive credentials are subject to the same moratorium...
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'net/sunrpc')
| -rw-r--r-- | net/sunrpc/auth.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c index 0667a36aee78..c40856f589f0 100644 --- a/net/sunrpc/auth.c +++ b/net/sunrpc/auth.c @@ -236,10 +236,13 @@ rpcauth_prune_expired(struct list_head *free, int nr_to_scan) list_for_each_entry_safe(cred, next, &cred_unused, cr_lru) { - /* Enforce a 60 second garbage collection moratorium */ + /* + * Enforce a 60 second garbage collection moratorium + * Note that the cred_unused list must be time-ordered. + */ if (time_in_range(cred->cr_expire, expired, jiffies) && test_bit(RPCAUTH_CRED_HASHED, &cred->cr_flags) != 0) - continue; + return 0; list_del_init(&cred->cr_lru); number_cred_unused--; @@ -258,7 +261,7 @@ rpcauth_prune_expired(struct list_head *free, int nr_to_scan) if (nr_to_scan == 0) break; } - return nr_to_scan; + return (number_cred_unused / 100) * sysctl_vfs_cache_pressure; } /* @@ -275,8 +278,7 @@ rpcauth_cache_shrinker(int nr_to_scan, gfp_t gfp_mask) if (list_empty(&cred_unused)) return 0; spin_lock(&rpc_credcache_lock); - nr_to_scan = rpcauth_prune_expired(&free, nr_to_scan); - res = (number_cred_unused / 100) * sysctl_vfs_cache_pressure; + res = rpcauth_prune_expired(&free, nr_to_scan); spin_unlock(&rpc_credcache_lock); rpcauth_destroy_credlist(&free); return res; |